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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2012 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: VaadinPersistentObjectListener.html 820 2014-01-22 16:41:52Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.pobj.vaadin;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.dellroad.stuff.pobj.PersistentObject;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.dellroad.stuff.pobj.PersistentObjectEvent;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.dellroad.stuff.pobj.PersistentObjectListener;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.dellroad.stuff.vaadin7.VaadinExternalListener;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>/**<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Specialization of {@link VaadinExternalListener} customized for listening to {@link PersistentObject}s.<a name="line.16"></a>
<span class="sourceLineNo">017</span> *<a name="line.17"></a>
<span class="sourceLineNo">018</span> * @param &lt;T&gt; type of the root persistent object<a name="line.18"></a>
<span class="sourceLineNo">019</span> */<a name="line.19"></a>
<span class="sourceLineNo">020</span>public abstract class VaadinPersistentObjectListener&lt;T&gt; extends VaadinExternalListener&lt;PersistentObject&lt;T&gt;&gt;<a name="line.20"></a>
<span class="sourceLineNo">021</span>  implements PersistentObjectListener&lt;T&gt; {<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>    public VaadinPersistentObjectListener(PersistentObject&lt;T&gt; pobj) {<a name="line.23"></a>
<span class="sourceLineNo">024</span>        super(pobj);<a name="line.24"></a>
<span class="sourceLineNo">025</span>    }<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>    @Override<a name="line.27"></a>
<span class="sourceLineNo">028</span>    public final void handleEvent(final PersistentObjectEvent&lt;T&gt; event) {<a name="line.28"></a>
<span class="sourceLineNo">029</span>        this.handleEvent(new Runnable() {<a name="line.29"></a>
<span class="sourceLineNo">030</span>            @Override<a name="line.30"></a>
<span class="sourceLineNo">031</span>            public void run() {<a name="line.31"></a>
<span class="sourceLineNo">032</span>                VaadinPersistentObjectListener.this.handlePersistentObjectChange(<a name="line.32"></a>
<span class="sourceLineNo">033</span>                  event.getOldRoot(), event.getNewRoot(), event.getVersion());<a name="line.33"></a>
<span class="sourceLineNo">034</span>            }<a name="line.34"></a>
<span class="sourceLineNo">035</span>        });<a name="line.35"></a>
<span class="sourceLineNo">036</span>    }<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    /**<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * Handle an update of the {@link PersistentObject} root object.<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * The current thread will already have the Vaadin session locked, so it<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * &lt;i&gt;should not invoke {@link #handleEvent handleEvent()}&lt;/i&gt; to handle the event.<a name="line.41"></a>
<span class="sourceLineNo">042</span>     *<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * &lt;p&gt;<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * The caller should not modify {@code oldRoot} or {@code newRoot}.<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * &lt;/p&gt;<a name="line.45"></a>
<span class="sourceLineNo">046</span>     *<a name="line.46"></a>
<span class="sourceLineNo">047</span>     * @param oldRoot previous root object; may be null if empty starts or stops are supported<a name="line.47"></a>
<span class="sourceLineNo">048</span>     * @param newRoot new root object; may be null if empty starts or stops are supported<a name="line.48"></a>
<span class="sourceLineNo">049</span>     * @param version version corresponding to {@code newRoot}<a name="line.49"></a>
<span class="sourceLineNo">050</span>     */<a name="line.50"></a>
<span class="sourceLineNo">051</span>    protected abstract void handlePersistentObjectChange(T oldRoot, T newRoot, long version);<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>    @Override<a name="line.53"></a>
<span class="sourceLineNo">054</span>    protected final void register(PersistentObject&lt;T&gt; pobj) {<a name="line.54"></a>
<span class="sourceLineNo">055</span>        pobj.addListener(this);<a name="line.55"></a>
<span class="sourceLineNo">056</span>    }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>    @Override<a name="line.58"></a>
<span class="sourceLineNo">059</span>    protected final void unregister(PersistentObject&lt;T&gt; pobj) {<a name="line.59"></a>
<span class="sourceLineNo">060</span>        pobj.removeListener(this);<a name="line.60"></a>
<span class="sourceLineNo">061</span>    }<a name="line.61"></a>
<span class="sourceLineNo">062</span>}<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>




























































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